<template>
    <div class="cart-box">
        <s-header :name="'购物车'" :noback="true"></s-header>
        <div class="cart-body">
            <van-checkbox-group @change="groupChange" v-model="result" ref="checkboxGroup">
                <van-swipe-cell :right-width="50" v-for="(item, index) in list" :key="index">
                    <div class="good-item">
                        <van-checkbox :name="item.cartItemId"/>
                        <div class="good-img"><img :src="$filters.prefix(item.goodsCoverImg)" alt=""></div>
                        <div class="good-desc">
                            <div class="good-title">
                                <span>{{ item.goodsName }}</span>
                                <span>x{{ item.goodsCount }}</span>
                            </div>
                            <div class="good-btn">
                                <div class="price">¥{{ item.sellingPrice }}</div>
                                <van-stepper
                                    integer
                                    :min="1"
                                    :max="5"
                                    :model-value="item.goodsCount"
                                    :name="item.cartItemId"
                                    async-change
                                    @change="onChange"
                                />
                            </div>
                        </div>
                    </div>
                    <template #right>
                        <van-button
                            square
                            icon="delete"
                            type="danger"
                            class="delete-button"
                            @click="deleteGood(item.cartItemId)"
                        />
                    </template>
                </van-swipe-cell>
            </van-checkbox-group>
        </div>
        <van-submit-bar
            v-if="list.length > 0"
            class="submit-all van-hairline--top"
            :price="total * 100"
            button-text="结算"
            @submit="onSubmit"
        >
            <van-checkbox @click="allCheck" v-model:checked="checkAll">全选</van-checkbox>
        </van-submit-bar>
        <div class="empty" v-if="!list.length">
            <img class="empty-cart" src="https://s.yezgea02.com/1604028375097/empty-car.png" alt="空购物车">
            <div class="title">购物车空空如也</div>
            <van-button round color="#1baeae" type="primary" @click="goTo" block>前往选购</van-button>
        </div>
        <nav-bar></nav-bar>
    </div>
</template>

<script>
import {reactive, onMounted, computed, toRefs} from 'vue'
import {useRouter} from 'vue-router'
import {useStore} from 'vuex'
import {Toast} from 'vant'
import navBar from '@/components/NavBar'
import sHeader from '@/components/SimpleHeader'
import {getCart, deleteCartItem, modifyCart} from '@/service/cart'

export default {
    name: "Cart",
    components: {
        navBar,
        sHeader
    },
    setup() {
        const router = useRouter()
        const store = useStore()
        const state = reactive({
            checked: false,
            list: [],
            all: false,
            result: [],
            checkAll: true,
        })

        onMounted(() => {
            init()
        })

        const init = async () => {
            Toast.loading({message: '加载中...', forbidClick: true});
            const {data} = await getCart({pageNumber: 1})
            state.list = data
            state.result = data.map(item => item.cartItemId)
            Toast.clear()
        }

        const total = computed(() => {
            let sum = 0
            let _list = state.list.filter(item => state.result.includes(item.cartItemId))
            _list.forEach(item => {
                sum += item.goodsCount * item.sellingPrice
            })
            return sum
        })

        const goBack = () => {
            router.go(-1)
        }

        const goTo = () => {
            router.push({path: '/home'})
        }

        const onChange = async (value, detail) => {
            if (value > 5) {
                Toast.fail('超出单个商品的最大购买数量')
                return
            }
            if (value < 1) {
                Toast.fail('商品不得小于0')
                return
            }
            if (state.list.filter(item => item.cartItemId == detail.name)[0].goodsCount == value) return
            Toast.loading({message: '修改中...', forbidClick: true});
            const params = {
                cartItemId: detail.name,
                goodsCount: value
            }
            await modifyCart(params)
            state.list.forEach(item => {
                if (item.cartItemId == detail.name) {
                    item.goodsCount = value
                }
            })
            Toast.clear()
        }

        const onSubmit = async () => {
            if (state.result.length == 0) {
                Toast.fail('请选择商品进行结算')
                return
            }
            const params = JSON.stringify(state.result)
            router.push({path: '/create-order', query: {cartItemIds: params}})
        }

        const deleteGood = async (id) => {
            await deleteCartItem(id)
            store.dispatch('updateCart')
            init()
        }

        const groupChange = (result) => {
            console.log(1)
            if (result.length == state.list.length) {
                console.log(2)
                state.checkAll = true
            } else {
                console.log(3)
                state.checkAll = false
            }
            state.result = result
        }

        const allCheck = () => {
            if (!state.checkAll) {
                state.result = state.list.map(item => item.cartItemId)
            } else {
                state.result = []
            }
        }

        return {
            ...toRefs(state),
            total,
            goBack,
            goTo,
            onChange,
            onSubmit,
            deleteGood,
            groupChange,
            allCheck
        }
    }
}
</script>

<style lang="less">
@import '../common/style/mixin';

.cart-box {
    .cart-header {
        position: fixed;
        top: 0;
        left: 0;
        z-index: 10000;
        .fj();
        .wh(100%, 44px);
        line-height: 44px;
        padding: 0 10px;
        .boxSizing();
        color: #252525;
        background: #fff;
        border-bottom: 1px solid #dcdcdc;

        .cart-name {
            font-size: 14px;
        }
    }

    .cart-body {
        margin: 16px 0 100px 0;
        padding-left: 10px;

        .good-item {
            display: flex;

            .good-img {
                img {
                    .wh(100px, 100px)
                }
            }

            .good-desc {
                display: flex;
                flex-direction: column;
                justify-content: space-between;
                flex: 1;
                padding: 20px;

                .good-title {
                    display: flex;
                    justify-content: space-between;
                }

                .good-btn {
                    display: flex;
                    justify-content: space-between;

                    .price {
                        font-size: 16px;
                        color: red;
                        line-height: 28px;
                    }

                    .van-icon-delete {
                        font-size: 20px;
                        margin-top: 4px;
                    }
                }
            }
        }

        .delete-button {
            width: 50px;
            height: 100%;
        }
    }

    .empty {
        width: 50%;
        margin: 0 auto;
        text-align: center;
        margin-top: 200px;

        .empty-cart {
            width: 150px;
            margin-bottom: 20px;
        }

        .van-icon-smile-o {
            font-size: 50px;
        }

        .title {
            font-size: 16px;
            margin-bottom: 20px;
        }
    }

    .submit-all {
        margin-bottom: 50px;

        .van-checkbox {
            margin-left: 10px
        }

        .van-submit-bar__text {
            margin-right: 10px
        }

        .van-submit-bar__button {
            background: @primary;
        }
    }

    .van-checkbox__icon--checked .van-icon {
        background-color: @primary;
        border-color: @primary;
    }
}
</style>
